Security Bulletin: Vulnerabilities in OpenSSH affect IBM i (CVE-2016-1907, CVE-2016-1908, CVE-2016-3115)

Summary

OpenSSH vulnerabilities affect IBM i. IBM i has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2016-3115 DESCRIPTION: OpenSSH could allow a remote authenticated attacker to execute arbitrary commands on the system, caused by improper validation of user-supplied X11 authentication credentials by the sshd server. By sending specially crafted X11 credential data, an attacker could exploit this vulnerability to inject xauth commands and execute arbitrary commands on the system with the privileges of the victim.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111431 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

CVEID: CVE-2016-1908 DESCRIPTION: OpenSSH could allow a remote authenticated attacker to bypass security restrictions, caused by the improper handling of errors when generating authentication cookies for untrusted X11 forwarding. An attacker could exploit this vulnerability to gain access to the target local X server.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110030 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-1907 DESCRIPTION: OpenSSH is vulnerable to a denial of service, caused by an out-of-bounds read in thessh_packet_read_poll2 function. A remote attacker could exploit this vulnerability using specially crafted network traffic to cause the application to crash.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110010 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Releases 6.1, 7.1 and 7.2 of IBM i are affected.

Remediation/Fixes

The issue can be fixed by applying a PTF to the IBM i Operating System.

Releases 6.1, 7.1 and 7.2 of IBM i are supported and will be fixed.

http://www-933.ibm.com/support/fixcentral/

The IBM i PTF numbers are:

Release 6.1 – SI60277 Release 7.1 – SI60302 Release 7.2 – SI60301

_Important note: _IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None known